Strainer for suction-pipes of pumps.



No. 704,0I2. Patented Iuly 8, |902.

W.R. EMERSON. STRAINER FOR SUGTION PlPES 0F PUMPS.`

(Application led Mn'. 22, 1902.)

(No Model.)

'fl/Wm YN: Nonms Firms co.. PNomLlrno., wnmmcm. D. c.

afluir SATES W'ILLIAM R. EMERSON, OF VASHINGTON, DISTRICT OF COLUMBIA.

STRAINER FOR SUCTlON-PIPES OF PUMPS.

SPECIFICATION forming part 0f Letters .Patent N0. 704,012, dated July 8, 1902.

A Application led March ZZ, 1902. Serial No. 99,494. (No inodelJ To all whom, it may concern/.-

Be it known that L'WILLIAM R. EMERSON, a citizen of the United States, residing at Washington, in the District of Col-u mbia,have invented certain new and useful Improvements in Strainers for Suction Pipes of Pumps; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon.

This invention relates to improvements in suction-pump apparatus, and particularly to the straining mechanism for the lower end of the suction-pipe, whereby the entering water is to a greater or less extent filtered or the entry of foreign matter prevented.

Thev objects of the invention are to provide a means whereby the above ends will be accomplished and at the same time permit the strainer to be withdrawn and cleaned without the necessityof withdrawing the suctionpipe itself and without the necessity of reducing the head of water for the purpose of cleaning.

With the above objects in View the invention consists generally in the provision of a foot-casting which is adapted to be connected to and supported by the suction-pipe itself and a strainer-casting which seats on said foot-casting, but is loosely mounted on and guided by the suction-pipe, whereby it may be drawn upwardly on said pipe to a point above the water-level for the purposeof cleaning and again lowered into position on the foot-casting.

More specifically, the invention consists in the provision of a strainer having a reduced central portion or collar adapted to surround and be guided by the suction-pipe with an outwardly-extending perforated apron having its edge formed to seat on the foot-casting on the end of the suction-pipe.

Further, the invention consists in certain novel details of construction and combinations and arrangements of parts, all as will be hereinafter described, and pointed out particularly in the appended claims.

Referring to the accompanying drawings, Figure l is a diagrammatic section through a well having a suction-pipe inplace therein and showing the application of one form of the strainer mechanism contemplated by the present invention. Fig. 2is an enlarged section through the lower end of the suctionpipe and strainer illustrated in Fig. l. Fig. 3 isa sectioncorresponding to Fig. 2, showing the application of the invention to a suction-pipe having a foot-valve.

Like letters of reference in the several iigures indicate the same parts.

The letterA indicates in the diagrammatic illustration, Fig. l, a well from which water is to be drawn by any suitable type of pumping apparatus through a suction pipe B. This suction-pipe B,as usual, extends straight down into the well and to a suitable distance below the water-level therein. At its lower end it is adapted to receive whatI shall herein term a foot-casting, which casting consists, essentially, of an imperforate bottom portion O, with suitable means for connecting such imperforate bottom portion C with the lower end of the suction pipe-as, for instance, the arms O-which extend upwardly and inwardly and at their ends are united by an annulus O2, adapted to surround the lower end of the suction-pipe B and to be connected therewith byany ordinary means, such as the screw-thread connection illustrated. The effect of this construction is to provide afootcasting having large apertures therein for the passage of the water to the suction-pipe, and it is obvious that while I have described and illustrated the arms C as the means for connecting the imperforate bottom portion of the casting with the suction-pipe this construction maybe variously modified to accomplish the same ends, and, if desired, the foot-casting may, instead of being connected directly with the lower end of the suction-pipe, be connected with or form a part of a foot-valve casting, as at D in Fig. 3, either construction, however, embodying the feature of an imperforate bottom portion with relatively large openings above the same for the free entry of the water.

The peripheral portion of the foot-'casting is in the form of an annular seat c, preferably inclined downwardly and outwardly,whereby foreign matter will be prevented from lodging thereon, as will be readily understood.

Surrounding and guided by the suction- IOO pipe itself is a strainer-casting, the peripheral or outer edge of which is adapted to seat on the annular seat c of the foot-casting, and in the preferred construction this strainercasting is formed with a central collar F, usually but slightly larger in internal diameter than the exterior of the suction-pipe itself and of sufficient length to afford an effective guide for centering the strainer-casting and preventing the same from tilting or getting out of alinement to such a degree as will cause the same to bind or lodge before reaching its seat on the footcasting. Extending outwardly, and in the form of casting illustrated downwardly, is a perforated apron F', forming a dome extending out around the foot-casting and with its lower edge of such diameter as to inclose the upwardly-extending arms Cf and seat on the annular seat c of the foot-casting, as shown clearly in Fig. 2. By enlarging the perforated portion of the strainer-casting the aggregate area of the perforations may be made sufficient to insure an unrestricted passage of the water to the suction-pipe, and by guiding the strainer-casting on the suctionpipe itself the seating of said casting on the foot-casting is insured, although in the preferred construction those portions of the footcasting above the imperforate bottom portion are preferably formed without abrupt exterior shoulders. In other words, all of said portions above said imperforate bottom are inclined, so as to form guides down which the lower edge of the strainer-casting will slide should it so happen that the said edge contacts therewith before reaching its seat, and the lower portions of the upwardly-extending arms C are preferably so shaped and positioned as to form guides around which the strainer-casting is properly centered on its seat. Thus we not only have the suctionpipe itself to serve as a centering-guide for the strainer-casting, but the arms of the footcasting subserve a similar purpose. Where a foot-valve casting is employed, the exterior lines of said casting are also formed on an inclination with the same objects in View, as will be readily understood from an inspection of Fig.

As a convenient means for raising and lowering the strainer-casting it may be formed with lateral eyes or loops G near the top, through which eyes a rope or other implement may be passed for raising the casting up, as indicated in dotted lines in Figs. 1 and 2. When so elevated, it is obvious that the strainer may be cleared from accumulations and when cleaned may be readily lowered into its working position. Owing to the separation of the castings, thereis little or no danger or liability of obstructions passing into, through, or partially through the perforations, so as to bind the strainer-casting to the foot-casting and so prevent it from being raised into position for cleaning. So, too, it is obvious that because of the spreading form of tho strainer-casting obstructions-such as Waste, lint, pieces of bagging, ra-which are liable to iind their way into the well will be carried up by the strainer-casting when elevated and may be removed, so as to avoid further obstruction or annoyance. By guiding the strainer-casting on the pipe it will be observed that the verticalheight of the whole Ymechanism may be very materially reduced without reducing the aperture area, and

hence the end of the pipe may be brought very near the bottom of the Well, so asto remove practica-lly all of the water therefrom.

Obviously the forms of the castings may be varied to suit any particular conditions or to conform to the lines of strainers and suctionpipes now commonly employed, and While I have specifically described the foot-casting and strainer-casting as castings ,it is obvious that they may be lnade of malleable, wrought, or other suitable kinds of metal and built into proper shape rather than formed in integral castings where such construction is found convenient or desirable.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination with a suction-pipe for a pump, of a foot-casting carried by but proj ecting below the pipe and having an imperforate bottom portion with a peripheral seat, of a strainer-casting having a reduced central portion surrounding and guided by the suction-pipe above the foot-casting, and a perforated apron extending out over said casting and seating at its edge on the peripheral seat of the imperforate portion; substantially as described.

2. The combination with the foot-casting having the imperforate lower portion with arms extending therefrom for attachment to the lower end of a suction-pipe, of the strainer-casting having a central collar for the passage of the suction-pipe, such collar being located above the foot-casting, and a perforated apron extending from said collar out over the foot-casting and adapted to seat on the imperforate portion thereof; substantially as described.

3. The combination with a foot-casting having the imperforate bottom portion, the arms extending therefrom, the annulus uniting the ends of said arms with means whereby said annulus may be secured to the lower end of a suction-pipe, of a strainer-casting having a collar for the passage of the suction-pipe above the foot-casting annulus and a perforated apron adapted to coperate with the periphery of the imperforate portion of the foot-casting, whereby the strainer-casting is guided by the suction-pipe and is adapted when in working position to bridge the space betweenv the imperforate portion of the footcasting and the suction-pipe to prevent the entry of obstructions; substantially as dcscribed.

4. The combination witha suction-pipe, a foot-casting secured to its lower end and em- IOO IIO

bodying animperforate portion and upwardlybodying a movable collar adapted to surround and be guided by the suction-pipe and an outwardly-aring perforated apron connected with and supported by said collar,

combined with a fixed foot-casting having au imperforate portion against which the peripheral portion of the apron seats; substantially as described. l WILLIAM R. EMERSON.

Witnesses:

ALEXANDER S. STEUART, B. BRUCE EMERSON. 

